249763009 has 2 divisors, whose sum is σ = 249763010. Its totient is φ = 249763008.

The previous prime is 249762991. The next prime is 249763013. The reversal of 249763009 is 900367942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140351409 + 109411600 = 11847^2 + 10460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249763009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (249763039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124881504 + 124881505.

It is an arithmetic number, because the mean of its divisors is an integer number (124881505).

Almost surely, 2^249763009 is an apocalyptic number.

It is an amenable number.

249763009 is a deficient number, since it is larger than the sum of its proper divisors (1).

249763009 is an equidigital number, since it uses as much as digits as its factorization.

249763009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 249763009 is about 15803.8922104651. The cubic root of 249763009 is about 629.7614020474.

The spelling of 249763009 in words is "two hundred forty-nine million, seven hundred sixty-three thousand, nine".